40 citations · 103 across the 8 of their papers we have counts for
8 papers
Suppression of Superconductivity in Heavy-ion Irradiated 2H-NbSe2 Caused by Negative Pressure
Wenjie Li, Sunseng Pyon, Ataru Ichinose +2
Effects of columnar defects created by 320 MeV Au irradiation on 2H-NbSe2 single crystals with a dose equivalent matching field up to 16 T were studied. Critical temperature is fou…
Finite-size effect of critical penetration of Pearl vortices in narrow superconducting flat rings
N. Kokubo, S. Okayasu, T. Nojima
We revisit the critical penetration of Pearl vortices in narrow superconducting flat rings cooled in magnetic fields. Scanning superconducting quantum interference device microscop…
Macroscale three-dimensional proximity effect in disordered normal/superconductor nanocomposites
Katsuya Ueno, Nobuhito Kokubo, Satoru Okayasu +8
Recently, interest in Superconductor (S)-Normal (N) interfaces was renewed by the observation of exotic proximity effects in various systems, including S/semiconductor, S/ferromagn…
Commensurate and Incommensurate Vortex States Confined in Mesoscopic Triangles of Weak Pinning Superconducting Thin Films
Nobuhito Kokubo, Hajime Miyahara, Satoru Okayasu +1
We report on the direct observation of vortex states confined in equilateral and isosceles triangular dots of weak pinning amorphous superconducting thin films with a scanning supe…
Enhancement of Critical Current Densities in (Ba,K)Fe2As2 by 320 MeV Au Irradiation in Single Crystals and by High-Pressure Sintering in PIT Wires
Sunseng Pyon, Toshihiro Taen, Fumiaki Ohtake +7
We demonstrate a large enhancement of critical current density (Jc) up to 1.0x10^7 A/cm2 at 5 K under self-field in (Ba,K)Fe2As2 single crystals by irradiating 320 MeV Au ions. Wit…
Scanning SQUID Microscope Study of Vortex Polygons and Shells in Weak Pinning Disks of an Amorphous Superconducting Film
Nobuhito Kokubo, Satoru Okayasu, Akinobu Kanda +1
Direct observation of vortices by the scanning SQUID microscopy was made on large mesoscopic disks of an amorphous MoGe thin film. Owing to the weak pinning nature of the amorphous…